Strings with embedded line breaks are hard to read.
Use concatenation or HEREDOCs instead.

my $foo = "Line one is quite long
Line two"; # Bad
my $foo = "Line one is quite long\nLine two"; # Better, but still hard to read
my $foo = "Line one is quite long\n"
. "Line two"; # Better still
my $foo = <<'EOF'; # Use heredoc for longer passages
Line one is quite long
Line two
Line three breaks the camel's back
EOF